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Temporal range: Late Miocene–Pliocene
Ashfall Fossil Beds - Teleoceras and Cormohipparion.jpg
Cormohipparion and Teleoceras in the Ashfall Fossil Beds
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Subfamily: Equinae
Genus: Cormohipparion
Skinner & MacFadden, 1977
Type species
Hipparion occidentale
Subgenera and Species


  • C. (C.) fricki Woodburne, 2007
  • C. (C.) goorisi MacFadden and Skinner, 1981
  • C. (C.) johnsoni Woodburne, 2007
  • C. (C.) matthewi Woodburne, 2007
  • C. (C.) merriami Woodburne, 2007
  • C. (C.) occidentale (Leidy, 1856) (type)
  • C. (C.) quinni Woodburne, 1996
  • C. (C.) skinneri Woodburne, 2007


  • C. (N.) plicatile (Leidy, 1887)
  • C. (N.) ingenuum (Leidy, 1885)
  • C. (N.) emsliei Hulbert, 1988

Cormohipparion is an extinct genus of horse belonging to the tribe Hipparionini that lived in North America during the late Miocene to Pliocene (Barstovian-Hemphilian).


The genus Cormohipparion was coined for the extinct hipparionin horse "Equus" occidentale, described by Joseph Leidy in 1856.[1] However it was soon argued that the partial material fell within the range of morphological variation seen in Hipparion, and that the members of Cormohipparion belonged instead within Hipparion.[2] This rested on claims that pre-orbital morphology did not have any taxonomic significance, a claim that detailed study of quarry sections later showed to be false.[3] A reappraisal of many horse genera was thus conducted in 1984,[4] and the proposed synonymy was not acknowledged by later literature.[5]

The genus is considered to represent an ancestor to Hippotherium.[6] Its fossils have been recovered from as far south as Mexico.[7]


  1. ^ Skinner, M. F.; MacFadden, B. J. (1977). "Cormohipparion n. Gen. (Mammalia, Equidae) from the North American Miocene (Barstovian-Clarendonian)". Journal of Paleontology. Paleontological Society. 51 (5): 912–926. doi:10.2307/1303763. JSTOR 1303763. 
  2. ^ Forsten, A. (1982). "The Status of the Genus Cormohipparion Skinner and MacFadden (Mammalia, Equidae)". Journal of Paleontology. Paleontological Society. 56 (6): 1332–1335. doi:10.2307/1304669. JSTOR 1304669. 
  3. ^ MacFadden, B. J.; Skinner, M. F. (1982). "Hipparion Horses and Modern Phylogenetic Interpretation_ Comments on Forsten's View of Cormohipparion". Journal of Paleontology. Paleontological Society. 56 (6): 1336–1342. doi:10.2307/1304670. JSTOR 1304670. 
  4. ^ MacFadden, BJ (1984). "Systematics and phylogeny of Hipparion, Neohipparion, Nannippus, and Cormohipparion (Mammalia, Equidae) from the Miocene and Pliocene of the new world". American Museum of Natural History. 
  5. ^ Hulbert Jr, R. C. (1988). "A New Cormohipparion (Mammalia, Equidae) from the Pliocene (Latest Hemphillian and Blancan) of Florida". Journal of Vertebrate Paleontology. The Society of Vertebrate Paleontology. 7 (4): 451–468. doi:10.1080/02724634.1988.10011675. JSTOR 4523166. 
  6. ^ Woodburne, M. O. (2005). "A New Occurrence of Cormohipparion, with Implications for the Old World Hippotherium Datum". Journal of Vertebrate Paleontology. 25: 256–257. doi:10.1671/0272-4634(2005)025[0256:ANOOCW]2.0.CO;2. ISSN 0272-4634. 
  7. ^ Bravo-Cuevas, V. M.; Ferrusquía-Villafranca, I. (2008). "Cormohipparion (Mammalia, Perissodactyla, Equidae) from the Middle Miocene of Oaxaca, Southeastern Mexico". Journal of Vertebrate Paleontology. 28: 243. doi:10.1671/0272-4634(2008)28[243:CMPEFT]2.0.CO;2. ISSN 0272-4634.